[Elecraft] Elecraft K3 Error Message

[bill wade]

On 20 meters, I get the following error message:ERR TXF. The manual 
indicates that the crystal filter selected for TX is either too narrow 
or too wide, and states the one must specify a filter that is 2.7 or 2.8 
KHz for ...SSB. My K3 only has two filters: the 5 pole 2.8 that came 
standard and an additional filter recommended for SSB, an 8 pole, 
numbered 2.7, I believe.
In a effort to correct this, I brought up the "configure crystal Filters 
in the K3 Utility and then proceeded to enter 2.7 or 2.8 and vice versa, 
applied the changes, but as soon as I try to TX in 20 meters the ERR TXF 
message reappears. Can anyone straighten me out on this?

Bill Wade, Ai4PF